CD74HCT377E

Overview

The CD74HCT377E is an octal D-type flip-flop featuring a data enable input and positive-edge triggering, manufactured by Texas Instruments under the HCT logic family. It operates with a supply voltage range of 4.5V to 5.5V and supports a maximum clock frequency of 50 MHz. The device provides balanced push-pull outputs with a maximum output current of 4mA for both high and low states. It exhibits a typical propagation delay of 38ns at 4.5V with a 50pF load and maintains a static supply current of 8µA. The component is rated for operation across an extended temperature range from -55°C to +125°C.

Feature Summary

• Octal configuration providing eight independent D-type flip-flops within a single package
• Data enable functionality allowing controlled storage of input data on the positive clock edge
• High-speed CMOS technology ensuring fast switching characteristics with low power consumption
• Military-grade temperature rating supporting reliable operation in extreme environmental conditions

Applications

• Parallel-to-serial data conversion circuits
• Shift register implementations requiring data latching
• Memory buffer stages in digital systems
• Timing control logic for sequential operations

Procurement Notes

Verify the manufacturer designation carefully, as Harris Corporation was acquired by L3Harris Technologies, and current production is managed by Texas Instruments. Confirm the specific suffix indicates the PDIP-20 through-hole package variant. Ensure compatibility with standard 5V logic levels required by the HCT series interface specifications before integration into existing designs.

Selection Notes

Select this component when an octal storage element with enable control is required for 5V logic applications. The HCT series ensures TTL-compatible input thresholds while maintaining CMOS noise immunity. Consider the 50MHz speed limit and 4mA drive capability against system requirements. Verify that the wide operating temperature range meets the environmental constraints of the intended deployment scenario.

Part Context

This device belongs to the widely adopted 74HCT logic family, known for bridging CMOS performance with TTL compatibility. The octal D-type flip-flop architecture is a fundamental building block in digital electronics, enabling complex state management and data synchronization tasks in microprocessor interfaces and communication protocols.

Replacement Considerations

Compatible substitutes include the CD54HC377 for HC series performance or the CD74HC377 for commercial grade variants. NXP offers the 74HCT377 in SSOP packages for space-constrained designs. Verify pinout compatibility and electrical parameters match before substitution.